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From the number, it was made AFTER 1945 (when they started to feature a model code before the serial number), but before 1969 (Triumph changed its serial numbering system to include a two-letter prefix to denote month and year of manufacture, followed by model code and serial number).
The "H" denotes that it is a 500 twin model.
The 1961 production run ran from H18612 toH25251. Your number falls into this range, so yes, it's a 1961, 500 cc engine, and the model of bike it came off of is called a "Trophy 500".
The F series engines are from Triumph Spitfires. FH is a 1300cc engine (1296cc) from a Spitfire Mk4. I can't remember if it's a small crank journal engine like the Herald 13/60 GE engine (good) or a large crank (not as good).
du2005 indicates it's a 1963 model, the first year of the "Unit Construction" engine (engine and transmission one unit, rather than the prior "Pre-Unit Construction engines)
Then 10th digit in the vin number tells you the year.
If it is a W = 1998
X = 1999
Y = 2000
If it is a 1 = 2001
2 = 2002
etc.
So your 12/07 bike is a 2008 and the 10th digit in your vin # will be an 8
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